/* ================================
   SUPPLEMENTHUB - STYLESHEET
   Mobile-First Responsive Design
   ================================ */

/* ===== CSS RESET ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* ===== ROOT VARIABLES ===== */
:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --accent-color: #2c3e50;
    --text-color: #333;
    --light-bg: #f8f9fa;
    --white: #ffffff;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 10px 40px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 15px 50px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s ease;
    --border-radius-sm: 10px;
    --border-radius-md: 20px;
    --border-radius-lg: 30px;
}

/* ===== BASE STYLES ===== */
html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background: var(--light-bg);
    overflow-x: hidden;
}

/* Screen Reader Only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* ===== HEADER STYLES ===== */
.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 120"><path d="M0,0V46.29c47.79,22.2,103.59,32.17,158,28,70.36-5.37,136.33-33.31,206.8-37.5C438.64,32.43,512.34,53.67,583,72.05c69.27,18,138.3,24.88,209.4,13.08,36.15-6,69.85-17.84,104.45-29.34C989.49,25,1113-14.29,1200,52.47V0Z" opacity=".25" fill="%23ffffff"/><path d="M0,0V15.81C13,36.92,27.64,56.86,47.69,72.05,99.41,111.27,165,111,224.58,91.58c31.15-10.15,60.09-26.07,89.67-39.8,40.92-19,84.73-46,130.83-49.67,36.26-2.85,70.9,9.42,98.6,31.56,31.77,25.39,62.32,62,103.63,73,40.44,10.79,81.35-6.69,119.13-24.28s75.16-39,116.92-43.05c59.73-5.85,113.28,22.88,168.9,38.84,30.2,8.66,59,6.17,87.09-7.5,22.43-10.89,48-26.93,60.65-49.24V0Z" opacity=".5" fill="%23ffffff"/><path d="M0,0V5.63C149.93,59,314.09,71.32,475.83,42.57c43-7.64,84.23-20.12,127.61-26.46,59-8.63,112.48,12.24,165.56,35.4C827.93,77.22,886,95.24,951.2,90c86.53-7,172.46-45.71,248.8-84.81V0Z" fill="%23ffffff"/></svg>') no-repeat;
    background-size: cover;
    opacity: 0.1;
}

/* ===== NAVIGATION ===== */
.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 5%;
    position: relative;
    z-index: 1000;
    transition: var(--transition);
}

.nav-container.scrolled {
    background: rgba(102, 126, 234, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    z-index: 1001;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 1001;
    padding: 5px;
}

.hamburger {
    width: 25px;
    height: 3px;
    background: var(--white);
    transition: var(--transition);
    border-radius: 3px;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
    padding: 0.5rem 0;
}

.nav-links a:hover,
.nav-links a:focus {
    transform: translateY(-2px);
    outline: none;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--white);
    transition: width 0.3s ease;
}

.nav-links a:hover::after,
.nav-links a:focus::after {
    width: 100%;
}

.cta-btn {
     background: #ceb82d;
    color: var(--primary-color);
    padding: 0.7rem 1.5rem;
    border-radius: 25px;
    font-weight: bold;
    transition: var(--transition);
}

.cta-btn:hover,
.cta-btn:focus {
    transform: scale(1.05);
    box-shadow: 0 5px 15px rgba(255, 255, 255, 0.3);
}

/* ===== HERO SECTION ===== */
.hero {
    text-align: center;
    padding: 4rem 5% 6rem;
    position: relative;
    z-index: 10;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    margin-bottom: 1rem;
    animation: fadeInUp 0.8s ease;
}

.hero p {
    font-size: clamp(1rem, 2vw, 1.2rem);
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto 2rem;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-btn {
    display: inline-block;
    background: var(--white);
    color: var(--primary-color);
    padding: 1rem 2.5rem;
    border-radius: var(--border-radius-lg);
    text-decoration: none;
    font-weight: bold;
    font-size: 1.1rem;
    transition: var(--transition);
    animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-btn:hover,
.hero-btn:focus {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    outline: 2px solid var(--white);
    outline-offset: 2px;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== MAIN CONTENT ===== */
.container {
    max-width: 1200px;
    margin: -50px auto 0;
    padding: 0 20px 3rem;
    position: relative;
    z-index: 100;
}

.page-title {
    text-align: center;
    font-size: clamp(2rem, 4vw, 2.5rem);
    color: var(--accent-color);
    margin-bottom: 3rem;
    position: relative;
    padding-bottom: 1rem;
}

.page-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 4px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: 2px;
}

/* ===== SUPPLEMENT CARDS ===== */
.supplement-card {
    background: var(--white);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-md);
    margin-bottom: 3rem;
    overflow: hidden;
    transition: transform 0.3s, box-shadow 0.3s;
}

.supplement-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.card-content {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 2rem;
    padding: 2.5rem;
}

.card-image {
    border-radius: 15px;
    overflow: hidden;
    position: relative;
    height: 250px;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.card-image:hover img {
    transform: scale(1.1);
}

.card-text h3 {
    font-size: clamp(1.3rem, 3vw, 1.8rem);
    color: var(--accent-color);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.card-text p {
    color: #666;
    margin-bottom: 1rem;
    line-height: 1.8;
}

.card-text em {
    color: #888;
    font-style: italic;
}

/* ===== BENEFITS SECTION ===== */
.benefits {
    background: var(--light-bg);
    padding: 1.5rem;
    border-radius: var(--border-radius-sm);
    margin: 1rem 0;
    border-left: 4px solid var(--primary-color);
}

.benefits strong {
    color: var(--accent-color);
    display: block;
    margin-bottom: 0.5rem;
}

.benefits ul {
    list-style: none;
    padding-left: 0;
    margin-top: 1rem;
}

.benefits li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.benefits li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
    font-size: 1.2rem;
}

/* ===== BUTTONS ===== */
.action-buttons {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

.btn {
    padding: 0.8rem 2rem;
    border: none;
    border-radius: 25px;
    font-weight: bold;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-block;
    font-size: 1rem;
}

.btn:focus {
    outline: 2px solid currentColor;
    outline-offset: 2px;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--white);
}

.btn-primary:hover,
.btn-primary:focus {
    background: #5568d3;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
}

.btn-secondary {
    background: var(--accent-color);
    color: var(--white);
}

.btn-secondary:hover,
.btn-secondary:focus {
    background: #1a252f;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(44, 62, 80, 0.3);
}

/* ===== FOOTER ===== */
.footer {
    background: var(--accent-color);
    color: var(--white);
    padding: 3rem 5% 1rem;
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto 2rem;
}

.footer-section h4 {
    margin-bottom: 1rem;
    color: var(--white);
    font-size: 1.2rem;
}

.footer-section p {
    line-height: 1.8;
    opacity: 0.9;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: var(--white);
    text-decoration: none;
    opacity: 0.9;
    transition: var(--transition);
}

.footer-section ul li a:hover {
    opacity: 1;
    padding-left: 5px;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    opacity: 0.8;
}

/* ===== SCROLL ANIMATION ===== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== RESPONSIVE DESIGN ===== */

/* Tablets (768px and below) */
@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        height: 100vh;
        width: 70%;
        max-width: 300px;
        background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
        flex-direction: column;
        padding: 5rem 2rem 2rem;
        gap: 1.5rem;
        transition: right 0.3s ease;
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.2);
        align-items: flex-start;
    }

    .nav-links.active {
        right: 0;
    }

    .nav-links li {
        width: 100%;
    }

    .nav-links a {
        display: block;
        padding: 0.5rem 0;
        font-size: 1.1rem;
    }

    .cta-btn {
        width: 100%;
        text-align: center;
    }

    .card-content {
        grid-template-columns: 1fr;
        padding: 1.5rem;
        gap: 1.5rem;
    }

    .card-image {
        height: 200px;
    }

    .hero {
        padding: 3rem 5% 4rem;
    }

    .container {
        margin-top: -30px;
        padding: 0 15px 2rem;
    }

    .action-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        text-align: center;
    }
}

/* Mobile phones (480px and below) */
@media (max-width: 480px) {
    .logo {
        font-size: 1.2rem;
    }

    .logo-icon {
        width: 35px;
        height: 35px;
        font-size: 1.2rem;
    }

    .nav-container {
        padding: 1rem 4%;
    }

    .hero {
        padding: 2rem 4% 3rem;
    }

    .hero h1 {
        font-size: 1.8rem;
    }

    .hero p {
        font-size: 0.95rem;
    }

    .hero-btn {
        padding: 0.8rem 1.8rem;
        font-size: 1rem;
    }

    .card-content {
        padding: 1rem;
    }

    .card-text h3 {
        font-size: 1.3rem;
    }

    .benefits {
        padding: 1rem;
    }

    .footer {
        padding: 2rem 4% 1rem;
    }

    .footer-content {
        gap: 1.5rem;
    }
}

/* Large screens (1200px and above) */
@media (min-width: 1200px) {
    .container {
        padding: 0 40px 3rem;
    }

    .card-content {
        padding: 3rem;
    }
}

/* Extra large screens (1440px and above) */
@media (min-width: 1440px) {
    html {
        font-size: 18px;
    }

    .container {
        max-width: 1400px;
    }
}

/* ===== PRINT STYLES ===== */
@media print {
    .header,
    .footer,
    .mobile-menu-toggle,
    .action-buttons {
        display: none;
    }

    body {
        background: white;
        color: black;
    }

    .supplement-card {
        page-break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ddd;
    }
}

/* ===== ACCESSIBILITY ===== */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    .header {
        background: #000;
    }

    .btn-primary,
    .btn-secondary {
        border: 2px solid currentColor;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --text-color: #e0e0e0;
        --light-bg: #1a1a1a;
        --accent-color: #4a5568;
    }

    body {
        background: var(--light-bg);
        color: var(--text-color);
    }

    .supplement-card {
        background: #2d3748;
    }

    .card-text p {
        color: #cbd5e0;
    }

    .benefits {
        background: #1a202c;
    }
}